<html>
<head>
<style type="text/css">
.f1 { font-family: Sans-Serif; }
.f2 { font-family: serif; }
.f3 { font-family: monospace; }
</style>
</head>
<body>
<p class="f1">sans-serif sample text</p>
<p class="f2">serif sample text</p>
<p class="f3">monospace sample text</p>
</body>
</html>
